BBO vs BBC
October 3rd, 2013, 07:05 AM
#41
"Trying to fix her right"
Join Date: Oct 2012
Location: Bartlett IL
Posts: 749
Thanks! Like I said I would have loved to dyno it to post an actual number.
June 11th, 2021, 03:19 AM
#43
Registered User
Join Date: Mar 2021
Location: Overland Park, KS
Posts: 59
I understand some of the comments, some I don't.
I'm doing these dyno sessions with different combinations with the blessing of the owners, and sometimes the cost for the additional time is out my own pocket. If any of you that posted less than stellar feedback want to do this then have at it. Dyno all the combos you want, but you'll have to pay for it.
As mentioned, if you want to then disregard the BBC reference and just compare the DX build with the iron headed 455. Similar carbs, same headers, same dyno on the same day, cam difference was only 3 degrees and .030 lift. But with 29 less cubic inches it made the same torque and 58 more Hp than the iron headed 455. Take it for what it's worth.
I'm doing these dyno sessions with different combinations with the blessing of the owners, and sometimes the cost for the additional time is out my own pocket. If any of you that posted less than stellar feedback want to do this then have at it. Dyno all the combos you want, but you'll have to pay for it.
As mentioned, if you want to then disregard the BBC reference and just compare the DX build with the iron headed 455. Similar carbs, same headers, same dyno on the same day, cam difference was only 3 degrees and .030 lift. But with 29 less cubic inches it made the same torque and 58 more Hp than the iron headed 455. Take it for what it's worth.
June 11th, 2021, 04:43 AM
#44
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Join Date: Aug 2012
Location: Colorado Springs Colorado/Thousand Oaks Ca
Posts: 1,722
Last edited by VORTECPRO; June 21st, 2021 at 06:20 AM.
June 11th, 2021, 12:42 PM
#45
Beer Connoisseur
Join Date: Aug 2008
Location: Daly City, California
Posts: 2,091
I completely understand and agree with the assessments you made. That's why my 67 400 BBO will be coming out of my 68 442 before I damage what is a good running engine. My 439 BBC with AFR 265 CNC Ovals, forged internals and custom hydraulic roller cam will be going in-between my frame rails. Hopefully it will also get a MPFI Terminator X or HP system at the same time.
That being said if I was to have a BBC engine built, I'd have Vortecpro build it.....just sayin.
June 11th, 2021, 01:29 PM
#46
Registered User
Join Date: Mar 2021
Location: Overland Park, KS
Posts: 59
I've already spoken with Vortech Pro a couple months ago. Waiting for him to get fully settled in his new location before I might just take it down there for a once over and a slight refresh.
We'll have to see, as there have been allot of unexpected costs come up with the car that have really eaten into my reserves.
June 12th, 2021, 06:55 AM
#47
Registered User
Join Date: Jan 2021
Posts: 292
If the Aftermarket for example Edelbrook. cast the same heads in both Alum, and iron. same ports, same chamber, same valves, same eveything.
Iron will make more power every time.
Alum wins in it is lighter and easier to cast/machine (read cheaper).
heat rejection matters
Iron will make more power every time.
Alum wins in it is lighter and easier to cast/machine (read cheaper).
heat rejection matters
June 12th, 2021, 04:19 PM
#48
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Thread Starter
Join Date: Nov 2008
Location: Central Fl
Posts: 7,971
Last edited by cutlassefi; June 13th, 2021 at 10:24 PM.
June 17th, 2021, 10:11 AM
#49
Registered User
Join Date: Mar 2021
Location: Overland Park, KS
Posts: 59
If the Aftermarket for example Edelbrook. cast the same heads in both Alum, and iron. same ports, same chamber, same valves, same eveything.
Iron will make more power every time.
Alum wins in it is lighter and easier to cast/machine (read cheaper).
heat rejection matters
Iron will make more power every time.
Alum wins in it is lighter and easier to cast/machine (read cheaper).
heat rejection matters
Iron vs. Aluminum Heads
But then why did manufacturers switch to Aluminum?
- It's lighter. So the car is lighter, performs better and in theory gets better MPG because of weight reductions all around. It is also cheaper to transport because it is lighter.
- Aluminum has a much lower melting point, so it is cast at lower temperatures than cast iron, which in mass manufacturing means that they can be cast more quickly and using less energy.
- Aluminum is much softer and thus easier, faster, and again cheaper to machine.
Plus porting Aluminum is so much easier.
Last edited by Amplitude; June 17th, 2021 at 10:17 AM.
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